(57) A method of forming a polymeric optical coupling waveguide (1) on a principal lightguide
(6) including a lightguiding layer (2), which comprises the steps of applying a photopolymerizable
monomer or a photocrosslinkable or photopolymerizable polymer or a mixture thereof
onto the principal lightguide (6), curing the polymeric optical coupling waveguide
(1) by exposure through a mask, and removing the unreacted area of the applied coat
with a suitable solvent. Other methods are exposure and solubilizing of a photosolubilizable polymer or photolithographic
patterning of the cured polymer. The coupling waveguide may be tapered, with the bigger cross section towards the end
face.
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